{"id":2967,"date":"2025-03-18T23:50:10","date_gmt":"2025-03-18T15:50:10","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=2967"},"modified":"2025-03-18T23:50:10","modified_gmt":"2025-03-18T15:50:10","slug":"php-%e5%ad%97%e7%ac%a6%e4%b8%b2%e5%8f%98%e9%87%8f%ef%bc%88string-variables%ef%bc%89","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/03\/18\/php-%e5%ad%97%e7%ac%a6%e4%b8%b2%e5%8f%98%e9%87%8f%ef%bc%88string-variables%ef%bc%89\/","title":{"rendered":"PHP \u5b57\u7b26\u4e32\u53d8\u91cf\uff08String Variables\uff09"},"content":{"rendered":"\n

1. \u4ec0\u4e48\u662f\u5b57\u7b26\u4e32\uff1f<\/strong><\/h2>\n\n\n\n

\u5728 PHP \u4e2d\uff0c\u5b57\u7b26\u4e32<\/strong>\uff08String\uff09\u662f\u4e00\u4e2a\u7531\u5b57\u7b26\u7ec4\u6210\u7684\u6570\u636e\u7c7b\u578b\uff0c\u7528\u4e8e\u8868\u793a\u6587\u672c\u6570\u636e\u3002PHP \u652f\u6301\u591a\u79cd\u65b9\u5f0f\u6765\u521b\u5efa\u548c\u64cd\u4f5c\u5b57\u7b26\u4e32\u53d8\u91cf\u3002<\/p>\n\n\n\n

\n\n\n\n

2. \u521b\u5efa\u5b57\u7b26\u4e32\u53d8\u91cf<\/strong><\/h2>\n\n\n\n

2.1 \u5355\u5f15\u53f7\uff08’\uff09\u5b57\u7b26\u4e32<\/strong><\/h3>\n\n\n\n

\u4f7f\u7528\u5355\u5f15\u53f7\u521b\u5efa\u7684\u5b57\u7b26\u4e32\u4f1a \u6309\u5b57\u9762\u503c<\/strong>\u8f93\u51fa\uff0c\u9664\u975e\u9047\u5230\u8f6c\u4e49\u5b57\u7b26\uff08\u5982 \\\\<\/code> \u6216 \\'<\/code>\uff09\u548c\u7279\u6b8a\u5b57\u7b26\uff08\u5982 \\n<\/code>\u3001\\r<\/code>\uff09\uff1a<\/p>\n\n\n\n

<?php\n$str1 = 'Hello, World!';    \/\/ \u521b\u5efa\u5b57\u7b26\u4e32\u53d8\u91cf\necho $str1;  \/\/ \u8f93\u51fa: Hello, World!\n?><\/code><\/pre>\n\n\n\n
\u6ce8\u610f\uff1a<\/strong><\/p>\n\n\n\n
    \n
  • \u5355\u5f15\u53f7\u5185\u7684 \u53d8\u91cf\u4e0d\u4f1a\u88ab\u89e3\u6790<\/strong>\u3002<\/li>\n\n\n\n
  • \u8f6c\u4e49\u5b57\u7b26\u4ec5\u9650\u4e8e \\\\<\/code>\uff08\u53cd\u659c\u6760\uff09\u548c \\'<\/code>\uff08\u5355\u5f15\u53f7\uff09\u3002<\/li>\n<\/ul>\n\n\n\n
    2.2 \u53cc\u5f15\u53f7\uff08”\uff09\u5b57\u7b26\u4e32<\/strong><\/h3>\n\n\n\n
    \u4f7f\u7528\u53cc\u5f15\u53f7\u521b\u5efa\u7684\u5b57\u7b26\u4e32\u4f1a \u89e3\u6790\u53d8\u91cf\u548c\u8f6c\u4e49\u5b57\u7b26<\/strong>\uff1a<\/p>\n\n\n\n
    <?php\n$name = \"Alice\";\n$str2 = \"Hello, $name!\";    \/\/ \u53cc\u5f15\u53f7\u5185\u89e3\u6790\u53d8\u91cf\necho $str2;  \/\/ \u8f93\u51fa: Hello, Alice!\n?><\/code><\/pre>\n\n\n\n
    \u7279\u6b8a\u5b57\u7b26\u89e3\u6790\uff1a<\/strong><\/p>\n\n\n\n
      \n
    • \\n<\/code> \u6362\u884c<\/li>\n\n\n\n
    • \\t<\/code> \u5236\u8868\u7b26<\/li>\n\n\n\n
    • \\\"<\/code> \u53cc\u5f15\u53f7<\/li>\n<\/ul>\n\n\n\n
      2.3 \u590d\u6742\u53d8\u91cf\u89e3\u6790<\/strong><\/h3>\n\n\n\n
      \u53cc\u5f15\u53f7\u5b57\u7b26\u4e32\u53ef\u4ee5\u5728\u82b1\u62ec\u53f7 {}<\/code> \u4e2d\u5305\u56f4\u53d8\u91cf\u6765\u786e\u4fdd\u6b63\u786e\u89e3\u6790\u53d8\u91cf\uff1a<\/p>\n\n\n\n
      <?php\n$name = \"Alice\";\n$str3 = \"Hello, {$name}!\";   \/\/ \u4f7f\u7528\u82b1\u62ec\u53f7\u660e\u786e\u53d8\u91cf\u8fb9\u754c\necho $str3;  \/\/ \u8f93\u51fa: Hello, Alice!\n?><\/code><\/pre>\n\n\n\n
      \n\n\n\n
      3. \u5b57\u7b26\u4e32\u8fde\u63a5<\/strong><\/h2>\n\n\n\n
      \u5728 PHP \u4e2d\uff0c\u5b57\u7b26\u4e32\u8fde\u63a5\u4f7f\u7528 .<\/code>\uff08\u70b9\u53f7\uff09<\/strong> \u8fd0\u7b97\u7b26\uff1a<\/p>\n\n\n\n
      <?php\n$str1 = \"Hello\";\n$str2 = \"World\";\n$str3 = $str1 . \" \" . $str2;  \/\/ \u8fde\u63a5\u5b57\u7b26\u4e32\necho $str3;  \/\/ \u8f93\u51fa: Hello World\n?><\/code><\/pre>\n\n\n\n
      \n\n\n\n
      4. \u591a\u884c\u5b57\u7b26\u4e32\uff08Heredoc \u548c Nowdoc\uff09<\/strong><\/h2>\n\n\n\n
      4.1 Heredoc<\/strong><\/h3>\n\n\n\n
      Heredoc<\/code> \u7528\u4e8e\u521b\u5efa \u591a\u884c\u5b57\u7b26\u4e32<\/strong>\uff0c\u5e76\u5141\u8bb8\u53d8\u91cf\u89e3\u6790\u3002\u5176\u8bed\u6cd5\u683c\u5f0f\uff1a<\/p>\n\n\n\n
      <?php\n$str4 = <<<EOD\nThis is a heredoc string.\nIt supports multiple lines.\nAnd it parses variables like $name.\nEOD;\necho $str4;\n?><\/code><\/pre>\n\n\n\n
        \n
      • EOD<\/code> \u662f\u4e00\u4e2a\u81ea\u5b9a\u4e49\u6807\u8bc6\u7b26\uff0c\u53ef\u4ee5\u4f7f\u7528\u5176\u4ed6\u6807\u8bc6\u7b26\uff0c\u53ea\u8981\u5b83\u4e0e\u5f00\u59cb\u548c\u7ed3\u675f\u6807\u8bc6\u7b26\u4e00\u81f4\u3002<\/li>\n\n\n\n
      • \u53d8\u91cf $name<\/code> \u4f1a\u88ab\u89e3\u6790\u3002<\/li>\n<\/ul>\n\n\n\n
        4.2 Nowdoc<\/strong><\/h3>\n\n\n\n
        Nowdoc<\/code> \u4e5f\u7528\u4e8e\u521b\u5efa\u591a\u884c\u5b57\u7b26\u4e32\uff0c\u4f46\u5b83 \u4e0d\u89e3\u6790\u53d8\u91cf<\/strong>\uff0c\u4e0e\u5355\u5f15\u53f7\u5b57\u7b26\u4e32\u76f8\u4f3c\u3002\u5176\u8bed\u6cd5\u683c\u5f0f\uff1a<\/p>\n\n\n\n
        <?php\n$str5 = <<<'EOD'\nThis is a nowdoc string.\nIt doesn't parse variables like $name.\nEOD;\necho $str5;\n?><\/code><\/pre>\n\n\n\n
          \n
        • \u4f7f\u7528 <<<'EOD'<\/code> \u6765\u58f0\u660e Nowdoc<\/code> \u5b57\u7b26\u4e32\u3002<\/li>\n<\/ul>\n\n\n\n
          \n\n\n\n
          5. \u5b57\u7b26\u4e32\u957f\u5ea6<\/strong><\/h2>\n\n\n\n
          \u53ef\u4ee5\u4f7f\u7528 strlen()<\/code><\/strong> \u51fd\u6570\u83b7\u53d6\u5b57\u7b26\u4e32\u7684 \u5b57\u8282\u957f\u5ea6<\/strong>\uff1a<\/p>\n\n\n\n
          <?php\n$str6 = \"Hello, World!\";\necho strlen($str6);  \/\/ \u8f93\u51fa: 13\n?><\/code><\/pre>\n\n\n\n
          \n\n\n\n
          6. \u5b57\u7b26\u4e32\u67e5\u627e<\/strong><\/h2>\n\n\n\n
          6.1 strpos()<\/strong><\/h3>\n\n\n\n
          strpos()<\/code> \u7528\u4e8e\u67e5\u627e\u5b50\u5b57\u7b26\u4e32\u9996\u6b21\u51fa\u73b0\u7684\u4f4d\u7f6e\uff1a<\/p>\n\n\n\n
          <?php\n$str7 = \"Hello, World!\";\necho strpos($str7, \"World\");  \/\/ \u8f93\u51fa: 7\n?><\/code><\/pre>\n\n\n\n
            \n
          • \u5982\u679c\u5b50\u5b57\u7b26\u4e32\u4e0d\u5b58\u5728\uff0cstrpos()<\/code> \u4f1a\u8fd4\u56de false<\/code><\/strong>\u3002<\/li>\n<\/ul>\n\n\n\n
            6.2 strstr()<\/strong><\/h3>\n\n\n\n
            strstr()<\/code> \u7528\u4e8e\u67e5\u627e\u5b50\u5b57\u7b26\u4e32\u53ca\u5176\u540e\u6240\u6709\u5b57\u7b26\uff1a<\/p>\n\n\n\n
            <?php\n$str8 = \"Hello, World!\";\necho strstr($str8, \"World\");  \/\/ \u8f93\u51fa: World!\n?><\/code><\/pre>\n\n\n\n
            \n\n\n\n
            7. \u5b57\u7b26\u4e32\u66ff\u6362<\/strong><\/h2>\n\n\n\n
            7.1 str_replace()<\/strong><\/h3>\n\n\n\n
            str_replace()<\/code> \u7528\u4e8e\u5c06\u5b50\u5b57\u7b26\u4e32\u66ff\u6362\u4e3a\u5176\u4ed6\u5185\u5bb9\uff1a<\/p>\n\n\n\n
            <?php\n$str9 = \"Hello, World!\";\n$newStr = str_replace(\"World\", \"Alice\", $str9);  \/\/ \u66ff\u6362 \"World\" \u4e3a \"Alice\"\necho $newStr;  \/\/ \u8f93\u51fa: Hello, Alice!\n?><\/code><\/pre>\n\n\n\n
            7.2 preg_replace()<\/strong><\/h3>\n\n\n\n
            preg_replace()<\/code> \u7528\u4e8e\u4f7f\u7528\u6b63\u5219\u8868\u8fbe\u5f0f\u8fdb\u884c\u66ff\u6362\uff1a<\/p>\n\n\n\n
            <?php\n$str10 = \"Hello, World!\";\n$newStr = preg_replace(\"\/World\/\", \"Alice\", $str10);  \/\/ \u4f7f\u7528\u6b63\u5219\u66ff\u6362\necho $newStr;  \/\/ \u8f93\u51fa: Hello, Alice!\n?><\/code><\/pre>\n\n\n\n
            \n\n\n\n
            8. \u5b57\u7b26\u4e32\u5207\u5272<\/strong><\/h2>\n\n\n\n
            8.1 substr()<\/strong><\/h3>\n\n\n\n
            substr()<\/code> \u7528\u4e8e\u83b7\u53d6\u5b57\u7b26\u4e32\u7684\u5b50\u5b57\u7b26\u4e32\uff1a<\/p>\n\n\n\n
            <?php\n$str11 = \"Hello, World!\";\necho substr($str11, 7, 5);  \/\/ \u8f93\u51fa: World\n?><\/code><\/pre>\n\n\n\n
              \n
            • \u7b2c\u4e8c\u4e2a\u53c2\u6570\u4e3a\u8d77\u59cb\u4f4d\u7f6e\uff0c\u7b2c\u4e09\u4e2a\u53c2\u6570\u4e3a\u957f\u5ea6\u3002<\/li>\n<\/ul>\n\n\n\n
              8.2 explode()<\/strong><\/h3>\n\n\n\n
              explode()<\/code> \u7528\u4e8e\u5c06\u5b57\u7b26\u4e32\u6309\u5206\u9694\u7b26\u62c6\u5206\u6210\u6570\u7ec4\uff1a<\/p>\n\n\n\n
              <?php\n$str12 = \"apple,banana,orange\";\n$fruits = explode(\",\", $str12);  \/\/ \u6309\u9017\u53f7\u62c6\u5206\nprint_r($fruits);  \/\/ \u8f93\u51fa: Array ( [0] => apple [1] => banana [2] => orange )\n?><\/code><\/pre>\n\n\n\n
              \n\n\n\n
              9. \u5b57\u7b26\u4e32\u683c\u5f0f\u5316<\/strong><\/h2>\n\n\n\n
              printf()<\/code> \u6216 sprintf()<\/code> \u7528\u4e8e\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\uff1a<\/p>\n\n\n\n
              <?php\n$name = \"Alice\";\n$age = 25;\necho sprintf(\"Name: %s, Age: %d\", $name, $age);  \/\/ \u8f93\u51fa: Name: Alice, Age: 25\n?><\/code><\/pre>\n\n\n\n
                \n
              • %s<\/code> \u8868\u793a\u5b57\u7b26\u4e32\uff0c%d<\/code> \u8868\u793a\u6574\u6570\u3002<\/li>\n<\/ul>\n\n\n\n
                \n\n\n\n
                10. \u5b57\u7b26\u4e32\u8f6c\u4e49<\/strong><\/h2>\n\n\n\n
                10.1 addslashes()<\/strong><\/h3>\n\n\n\n
                addslashes()<\/code> \u7528\u4e8e\u5bf9\u5b57\u7b26\u4e32\u4e2d\u7684\u7279\u6b8a\u5b57\u7b26\uff08\u5982\u5f15\u53f7\u3001\u53cd\u659c\u6760\uff09\u8fdb\u884c\u8f6c\u4e49\uff1a<\/p>\n\n\n\n
                <?php\n$str13 = \"It's a \\\"wonderful\\\" world!\";\necho addslashes($str13);  \/\/ \u8f93\u51fa: It\\'s a \\\"wonderful\\\" world!\n?><\/code><\/pre>\n\n\n\n
                10.2 stripslashes()<\/strong><\/h3>\n\n\n\n
                stripslashes()<\/code> \u7528\u4e8e\u53bb\u9664\u5b57\u7b26\u4e32\u4e2d\u7684\u8f6c\u4e49\u5b57\u7b26\uff1a<\/p>\n\n\n\n
                <?php\n$str14 = \"It\\'s a \\\"wonderful\\\" world!\";\necho stripslashes($str14);  \/\/ \u8f93\u51fa: It's a \"wonderful\" world!\n?><\/code><\/pre>\n\n\n\n
                \n\n\n\n
                11. \u5b57\u7b26\u4e32\u6bd4\u8f83<\/strong><\/h2>\n\n\n\n
                strcmp()<\/code> \u7528\u4e8e\u6bd4\u8f83\u4e24\u4e2a\u5b57\u7b26\u4e32\uff0c\u533a\u5206\u5927\u5c0f\u5199\uff1a<\/p>\n\n\n\n
                <?php\n$str15 = \"Hello\";\n$str16 = \"hello\";\necho strcmp($str15, $str16);  \/\/ \u8f93\u51fa: -1 (\u56e0\u4e3a\u5927\u5c0f\u5199\u4e0d\u540c)\n?><\/code><\/pre>\n\n\n\n
                strcasecmp()<\/code> \u7528\u4e8e\u6bd4\u8f83\u4e24\u4e2a\u5b57\u7b26\u4e32\uff0c\u4e0d\u533a\u5206\u5927\u5c0f\u5199\uff1a<\/p>\n\n\n\n
                <?php\necho strcasecmp(\"Hello\", \"hello\");  \/\/ \u8f93\u51fa: 0 (\u5ffd\u7565\u5927\u5c0f\u5199\u6bd4\u8f83)\n?><\/code><\/pre>\n\n\n\n
                \n\n\n\n
                \u603b\u7ed3<\/strong><\/h2>\n\n\n\n
                  \n
                • \u5355\u5f15\u53f7\u5b57\u7b26\u4e32<\/strong>\uff1a\u7b80\u5355\u3001\u6309\u5b57\u9762\u8f93\u51fa\uff0c\u4e0d\u89e3\u6790\u53d8\u91cf\u3002<\/li>\n\n\n\n
                • \u53cc\u5f15\u53f7\u5b57\u7b26\u4e32<\/strong>\uff1a\u652f\u6301\u53d8\u91cf\u89e3\u6790\u548c\u7279\u6b8a\u5b57\u7b26\u3002<\/li>\n\n\n\n
                • Heredoc \u548c Nowdoc<\/strong>\uff1a\u7528\u4e8e\u5904\u7406\u591a\u884c\u5b57\u7b26\u4e32\uff0cHeredoc \u652f\u6301\u53d8\u91cf\u89e3\u6790\uff0cNowdoc \u4e0d\u652f\u6301\u3002<\/li>\n\n\n\n
                • \u5e38\u7528\u5b57\u7b26\u4e32\u51fd\u6570<\/strong>\uff1a\u5305\u62ec strlen()<\/code>\u3001strpos()<\/code>\u3001substr()<\/code>\u3001str_replace()<\/code> \u7b49\uff0c\u7528\u4e8e\u64cd\u4f5c\u5b57\u7b26\u4e32\u3002<\/li>\n<\/ul>\n\n\n\n
                  \u901a\u8fc7\u5408\u7406\u4f7f\u7528 PHP \u63d0\u4f9b\u7684\u5404\u79cd\u5b57\u7b26\u4e32\u51fd\u6570\u548c\u8bed\u6cd5\uff0c\u53ef\u4ee5\u9ad8\u6548\u5730\u5904\u7406\u5b57\u7b26\u4e32\u64cd\u4f5c\u3002<\/p>\n\n\n\n
                  \u66f4\u591a\u8be6\u7ec6\u5185\u5bb9\u8bf7\u5173\u6ce8\u5176\u4ed6\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
                  1. \u4ec0\u4e48\u662f\u5b57\u7b26\u4e32\uff1f \u5728 PHP \u4e2d\uff0c\u5b57\u7b26\u4e32\uff08String\uff09\u662f\u4e00\u4e2a\u7531\u5b57\u7b26\u7ec4\u6210\u7684\u6570\u636e\u7c7b\u578b\uff0c\u7528\u4e8e\u8868\u793a\u6587\u672c\u6570\u636e\u3002PH […]<\/p>\n","protected":false},"author":1,"featured_media":2968,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[80],"tags":[],"class_list":["post-2967","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-php"],"_links":{"self":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/2967","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/comments?post=2967"}],"version-history":[{"count":1,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/2967\/revisions"}],"predecessor-version":[{"id":2969,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/2967\/revisions\/2969"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media\/2968"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=2967"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=2967"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=2967"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}